Isaac Asimov's I Robot: To Obey

Susan Calvin is about to enter her second year as a psych resident at the Manhattan Hasbro teaching hospital when a violent crime strikes very close to home.
 
When she was young, Susan lost her mother in a terrible car wreck that also badly injured her father. She now believes the accident was orchestrated by government officials who wanted her parents dead. Susan has always known there was a faction of the U.S. government that wanted to hijack her father’s work for military use. Now it seems that faction is back.
 
As she struggles to overcome her pain and confusion, as well as deal with her studies, Susan finds herself hunted by violent antitech vigilantes who would revert mankind to the Dark Ages—and at the same time she’s being watched very closely by extremists who want high-tech genocide. Somehow she must find a way to stop them both.

Standard and Primary covers are widely available through general retailers. They often have higher print runs and can be cheaper, especially during sales.

In contrast, Direct Market (DM) and variant covers are primarily sold in comic shops. DM editions tend to have more limited availability and may be more valuable to collectors.

The main differences lie in artwork style, availability, price, and collector appeal. Ultimately, the choice between standard and variant covers depends on personal preference, budget, and individual collecting goals.

Comic book enthusiasts have various formats to choose from when collecting their favorite stories.
Here's a brief overview of the main types:

Omnibus

• Large, hardcover collections
• Usually contain complete runs or extensive story arcs
• Typically 800-1000+ pages
• Higher price point, often €100-€150

Oversized Hardcover (OHC)

• Similar dimensions to omnibus, but thinner
• Collect shorter runs or story arcs
• Usually 300-600 pages
• Priced between €30-€50

Hardcover (HC)

• Standard-sized hardcover books
• Collect 6-12 issues typically
• Similar dimensions to single issues, but with a hard cover
• Priced around €25-€35

Trade Paperback (TP)

• Softcover collections
• Standard comic book size
• Usually collect 4-6 issues
• Most affordable option, typically €15-€25

Other Formats

• Absolute Editions: Oversized, deluxe hardcovers (mainly DC Comics)
• Compendiums: Massive paperback collections
• Graphic Novels (OGN/GN): Original stories not previously released as single issues

The choice between these formats often depends on personal preference, budget, and collecting goals. Omnibus and OHC editions offer larger artwork and more content but at a higher price, while TPs provide a more affordable way to collect complete story arcs