Reading clue route
For the reading-related clue, trace BOOK from row 2, column 4. Move left to row 2, column 3, continue left to row 2, column 2, then turn down to row 3, column 2. The letters read B → O → O → K. This route is four cells long, crosses two columns in row 2 before its single turn, and finishes one row below its start.
For an exact check, use this coordinate transcript: 1 at row 2, column 4; 2 at row 2, column 3; 3 at row 2, column 2; 4 at row 3, column 2. The path has two left moves followed by one down move. It begins with four open orthogonal neighbors at row 2, column 4 and ends with three at row 3, column 2, so the final down step is worth checking rather than assuming from the repeated O letters.